Viscous material container having annularly contacting piston

Description

[0001] The present invention relates to a viscous material container configured to contain a viscous material and discharge an appropriate amount of the viscous material.

[0002] In treating a dental viscous material with a high viscosity such as a dental filling material, an artificial tooth material, and a tooth crown material in the dental field, a viscous material container such as a dental viscous material container that is a disposable container filled with the dental viscous material is used. The dental viscous material container is set onto a dedicated pushing device with a handle, and the handle of the pushing device is operated to discharge an appropriate amount of the dental viscous material from the dental viscous material container.

[0003] JP10-179608A describes an example of the viscous material container according to the related art. The viscous material container includes a housing including a first section, a second section, and a third section. The first section has an insertion port at an end thereof, and includes a first inner wall surface configured to surround a first passage extending along an imaginary center line from the insertion port and having a transverse sectional shape that is circular about the imaginary center line. The second section has a discharge port at an end thereof, and includes a second inner wall surface configured to surround a second passage extending from the discharge port. The third section is positioned between the first section and the second section, and includes a third inner wall surface configured to surround a third passage communicating with the first passage and the second passage. A piston is inserted into the first passage to push out a viscous material, which is contained in the first passage, from the discharge port through the second and third passages. As illustrated in Fig. 1 of JP10-179608A, the piston (13) includes: one seal ring (14) configured to contact the first inner wall surface as the piston is inserted in the first passage; and a pair of non-contact portions (15) configured not to contact the first inner wall surface as the piston is inserted in the first passage, located at both sides of the seal ring (14) in the direction of extension of the imaginary center line and having an outside diameter that is smaller than that of the seal ring (14). The pair of non-contact portions (15) of the piston (13) is shaped to be plane-symmetric with respect to an imaginary surface that includes the seal ring (14) and is orthogonal to the imaginary center line.

[0004] In the structure described in JP10-179608A, however, air may remain in the housing when the piston is inserted from the insertion port of the housing. If air remains in the housing, air bubbles may mix into the viscous material when the viscous material is pushed out from the discharge port. In the dental field, in particular, intrusion of such air bubbles may change the apparent color of the viscous material or cause growth of bacteria from the air bubbles. In addition, the remaining air may reduce a resistive force exerted from inside the housing when the piston is pushed in. This may change a feel (tactile response) obtained when the piston is pushed in, and makes it difficult to control a force for pushing in the piston. EP 1 147 747 A2 discloses a container according to the preamble of claim 1.

[0005] US 5 893 714 A discloses a container having a symmetrical piston. A preferred aim of the present invention is to provide a viscous material container that makes it unlikely that air remains in a housing when a piston is inserted from an insertion port of the housing.

[0006] The present invention is directed to a viscous material container including a housing and a piston according to claim 1. Further embodiments are defined in the appended claims 2-6. The housing includes a first section, a second section, and a third section. The first section has an insertion port at an end thereof, and includes a first inner wall surface configured to surround a first passage extending along a first imaginary center line from the insertion port and having a transverse sectional shape that is circular about the first imaginary center line. The second section has a discharge port at an end thereof, and includes a second inner wall surface configured to surround a second passage extending along a second imaginary center line from the discharge port and having a transverse sectional shape that is circular about the second imaginary center line. The second imaginary center line intersects the first imaginary center line. The third section is positioned between the first section and the second section, and includes a third inner wall surface configured to surround a third passage communicating with the first passage and the second passage. The piston is operable to move inside at least the first passage to push out a viscous material, which is contained in the first passage, from the discharge port through the second and third passages. The piston includes one annularly circular contact portion and a pair of non-contact portions. The one annularly circular contact portion is configured to contact the first inner wall surface as the piston is inserted in the first passage. The pair of non-contact portions are configured not to contact the first inner wall surface as the piston is inserted in the first passage, located at both sides of the annularly circular contact portion in a direction of extension of the first imaginary center line and having an outside diameter that is smaller than that of the annularly circular contact portion. The pair of non-contact portions are shaped to be plane-symmetric with respect to a first imaginary surface that includes the annularly circular contact portion and is orthogonal to the first imaginary center line. In the present invention, in particular, the first section of the housing is formed with at least one groove portion communicating with the first passage to discharge air in the first passage when the piston is inserted from the insertion port. The at least one groove portion communicates with the insertion port, and extends along the first imaginary center line. The length of the at least one groove portion along the first imaginary center line and the length of the non-contact portions of the piston are determined such that air in the housing is discharged out of the housing through the at least one groove portion until the piston is inserted into the first passage to the extent that the annularly circular contact portion goes beyond the at least one groove portion. If at least one groove portion is formed as in the present invention, air in the first passage can be guided to the groove portion when the piston is inserted from the insertion port. Consequently, air in the housing can be reliably discharged.

[0007] If the piston is provided with the pair of non-contact portions, the piston can be temporarily arranged during insertion. Further, if the pair of non-contact portions are shaped to be plane-symmetric, the piston can be inserted from the insertion port from either non-contact portion side. The area of contact between the piston and the housing is small. Therefore, even if the housing and the piston are each unitarily formed from the same resin material, the piston still can slide smoothly.

[0008] Preferably, the pair of non-contact portions each have an annular non-contact surface that is adjacent to the annularly circular contact portion and has a diameter that is 90% or more of that of the first inner wall surface. If the annular non-contact surfaces are formed in this way, the annular non-contact surfaces can be fitted well in the first inner wall surface to reliably temporarily arrange the piston.

[0009] The distance between an end portion of the at least one groove portion on the first passage side and an end portion thereof on the first section insertion port side is preferably equal to the distance between an end surface of the piston to be inserted into the first passage and the annularly circular contact portion. Such a configuration allows air to be completely discharged when the piston is completely inserted into the first passage.

[0010] The pair of non-contact portions are preferably shaped such that the annularly circular contact portion is positioned at a vertex of an arcuate shape when the piston is cut along a second imaginary surface that includes the first imaginary center line and that is orthogonal to the first imaginary surface. If the pair of non-contact portions are formed in this way, the area of contact between the piston and the housing can be reduced, which allows the viscous material to be pushed out with a small force.

[0011] An end portion of each of the pair of non-contact portions is preferably shaped to surface-contact the third inner wall surface surrounding the third passage. If the shape of the end portion of each of the non-contact portions is determined in this way, it is possible to discharge a larger amount of the viscous material.
In the drawings

Fig. 1 is a front view of a dental viscous material container as a type of a viscous material container according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along the line A-A of Fig. 1.

Fig. 3 is a cross-sectional view taken along the line A-A of Fig. 1 with a piston pushed in.

Fig. 4 is a cross-sectional view taken along the line B-B of Fig. 2.

Fig. 5 is a side view of the piston according to the embodiment of the present invention.

Fig. 6 is a front view of the piston.

Fig. 7 is a cross-sectional view of the piston taken along a second imaginary surface, illustrating a part of an annularly circular contact portion and the surroundings thereof as enlarged.

[0012] An embodiment in which the present invention is applied to a dental viscous material container as a type of a viscous material container will be described below with reference to the drawings.

[0013] Fig. 1 is a front view of a dental viscous material container 1 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view taken along the line A-A of Fig. 1. Fig. 3 is a cross-sectional view taken along the line A-A of Fig. 1 with a piston pushed in. Fig. 4 is a cross-sectional view taken along the line B-B of Fig. 2. The dental viscous material container 1 has a housing 3 configured to house a dental viscous material (not illustrated) and a piston 5 operable to push out the dental viscous material. The housing 3 and the piston 5 are each unitarily formed from the same resin material. Examples of the resin material include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resins, nylon, phenol resins, polyurethane, saturated polyester resins, melamine resins, polyvinylidene chloride, unsaturated polyester resins, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resins, styrol resins, polymethylpentene, methacrylic styrene, ABS (acrylonitrile butadiene styrene) resins, and polycarbonate. In the embodiment, polypropylene is used. The housing 3 is formed using a material that does not transmit visible rays. Consequently, even if a photocurable dental viscous material is housed in the housing 3, it is possible to prevent the dental viscous material from being cured during storage.

[0014] The housing 3 includes an insertion port 7 into which the piston 5 is inserted and to which a dedicated pushing device (not illustrated) with a handle is to be connected, and a discharge port 9 from which the dental viscous material is discharged. The housing 3 includes a first section 11 having the insertion port 7 at an end thereof, a second section 13 having the discharge port 9 at an end thereof, and a third section 15 positioned between the first section 11 and the second section 13. The first section 11 includes a first inner wall surface 19 configured to surround a first passage 17 extending along a first imaginary center line L1 from the insertion port 7 and having a transverse sectional shape that is circular about the first imaginary center line L1. The second section 13 includes a second inner wall surface 23 configured to surround a second passage 21 extending along a second imaginary center line L2 from the discharge port 9 and having a transverse sectional shape that is circular about the second imaginary center line L2. The second imaginary center line L2 intersects the first imaginary center line L1. The third section 15 includes a third inner wall surface 27 configured to surround a third passage 25 communicating with the first passage 17 and the second passage 21.

[0015] The dental viscous material container 1 also includes a continuous angular portion 29 formed at a boundary portion between the second inner wall surface 23 and the third inner wall surface 27 to extend over a predetermined angular range. The continuous angular portion 29 extends in the circumferential direction with respect to an angular portion 29a located in an imaginary surface S including the first imaginary center line L1 and the second imaginary center line L2. The angular portion 29a has an angle equal to an intersection angle between the first imaginary center line L1 and the second imaginary center line L2.

[0016] The first section 11 is formed with two groove portions 35 and 37 communicating with the first passage 17 to discharge air in the first passage 17 when the piston 5 is inserted from the insertion port 7. The two groove portions 35 and 37 communicate with the insertion port 7, and extend along the first imaginary center line L1. The length of the groove portions 35 and 37 along the first imaginary center line L1 and the length of a non-contact portion 39 of the piston 5 to be discussed later are determined such that air in the housing 3 is discharged out of the housing 3 through the groove portions 35 and 37 until the piston 5 is inserted into the first passage 11 to the extent that an annularly circular contact portion 43 of the piston 5 goes beyond the groove portions 35 and 37. If the groove portions 35 and 37 are formed in this way, air in the first passage 17 can be guided to the groove portions 35 and 37 when the piston 5 is inserted from the insertion port 7. Consequently, air in the housing 3 can be reliably discharged. In the embodiment, two groove portions are formed. However, it is a matter of course that one or three or more groove portions may be formed as long as air in the housing 3 can be reliably discharged.

[0017] Next, the shape of the piston 5 will be described. Fig. 5 is a side view of the piston 5. Fig. 6 is a front view of the piston 5. Fig. 7 is a cross-sectional view of the piston 5 taken along the second imaginary surface S2, illustrating a part of the annularly circular contact portion 43 and the surroundings thereof as enlarged. The piston 5 includes the annularly circular contact portion 43 and a pair of non-contact portions 39 and 41. The annularly circular contact portion 43 contacts the first inner wall surface 19 as the piston 5 is inserted in the first passage 17. The pair of non-contact portions 39 and 41 do not contact the first inner wall surface 19 as the piston 5 is inserted in the first passage 17, located at both sides of the annularly circular contact portion 43 in the direction of extension of the first imaginary center line L1 and having an outside diameter that is smaller than that of the annularly circular contact portion 43. If the piston 5 is provided with the pair of non-contact portions 39 and 41, the piston 5 can be temporarily arranged during insertion. Further, if the pair of non-contact portions 39 and 41 are shaped to be plane-symmetric, the piston 5 can be inserted from the insertion port 7 from either non-contact portion side. The area of contact between the piston 5 and the housing 3 is small. Therefore, even if the housing 3 and the piston 5 are each unitarily formed from the same resin material, the piston 5 still can slide smoothly.

[0018] The pair of non-contact portions 39 and 41 each have an annular non-contact surface 45 that is adjacent to the annularly circular contact portion 43. The annular non-contact surface 45 has a diameter that is 90% or more of that of the first inner wall surface 19. If the annular non-contact surfaces 45 are formed in this way, the annular non-contact surfaces 45 can be fitted well in the first inner wall surface 19 to reliably temporarily arrange the piston 5. An end portion 47 of each of the pair of non-contact portions 39 and 41 is shaped to surface-contact the third inner wall surface 27 surrounding the third passage 25. If the shape of the end portion 47 of each of the pair of non-contact portions 39 and 41 is determined in this way, it is possible to discharge a larger amount of the dental viscous material without waste. In the embodiment, the end portion 47 is formed in a truncated conical shape. As illustrated in Fig. 3, a surface 27a of the third inner wall surface 27 on the upper side (the side facing the angular portion 29a) and a conical surface 47a of the end portion 47 on the upper side surface-contact each other with the piston 5 completely pushed toward the discharge port 9.

[0019] The distance between an end surface 49 of the piston 5 to be inserted into the first passage 17 and the annularly circular contact portion 43 is equal to the distance between respective end portions 51 and 53 of the groove portions 35 and 37 on the first passage 17 side and an end portion 55 of the first section 11 on the insertion port 7 side. Such a configuration allows air to be completely discharged when the piston 5 is completely inserted into the first passage 17. In addition, the pair of non-contact portions 39 and 41 are shaped such that the annularly circular contact portion 43 is positioned at a vertex of an arcuate shape when the piston 5 is cut along the second imaginary surface S2 which includes the first imaginary center line L1 and which is orthogonal to the first imaginary surface S1. If the pair of non-contact portions 39 and 41 are formed in this way, the area of contact between the piston 5 and the housing 3 can be reduced, which allows the dental viscous material to be pushed out with a small force.

[0020] In the embodiment described above, the housing 3 and the piston 5 are formed from the same material. However, it is a matter of course that the housing 3 and the piston 5 may be formed from different materials.

[0021] In the embodiment described above, the discharge port 9 is exposed. However, it is a matter of course that the third section 15 may be fitted with a cap configured to block the discharge port 9. In this case, an engagement structure may be provided between the outer peripheral portion of the third section 15 and the cap to prevent the cap from falling off.

[0022] According to the present invention, the groove portions are formed to discharge air in the first passage when the piston is inserted from the insertion port. Thus, air in the first passage can be guided to the groove portions when the piston is inserted from the insertion port. As a result, air in the housing can be reliably discharged.

Description of Reference Numerals

[0023] 

1

dental viscous material container

3

housing

5

piston

7

insertion port

9

discharge port

11

first section

13

second section

15

third section

17

first passage

19

first inner wall surface

21

second passage

23

second inner wall surface

25

third passage

27

third inner wall surface

27a

surface

29

continuous angular portion

29a

angular portion

31

wall portion

33

recessed portion

35, 37

groove portion

39, 41

non-contact portion

43

annularly circular contact portion

45

annular non-contact surface

47

end portion

47a

conical surface

49

end surface

51, 53

end portion

55

end portion

L1

first imaginary center line

L2

second imaginary center line

S

imaginary surface

S1

first imaginary surface

S2

second imaginary surface

Claims

1. A viscous material container for containing a viscous material to be inserted into the container through an insertion port (7) of the container, the container comprising:

a housing (3) comprising:

a first section (11) having the insertion port (7) at an end thereof and including a first inner wall surface (19) configured to surround a first passage (17) extending along a first imaginary center line (L1) from the insertion port (7) and having a transverse sectional shape that is circular about the first imaginary center line (L1);

a second section (13) having a discharge port (9) at an end thereof and including a second inner wall surface (23) configured to surround a second passage (21) extending along a second imaginary center line (L2) from the discharge port (9) and having a transverse sectional shape that is circular about the second imaginary center line (L2), the second imaginary center line (L2) intersecting the first imaginary center line (L1); and

a third section (15) positioned between the first section (11) and the second section (13) and including a third inner wall surface (27) configured to surround a third passage (25) communicating with the first passage (17) and the second passage (21); and

a piston (5) operable to move inside at least the first passage (17) to push out a viscous material, which is contained in at least the first passage (17), from the discharge port through the second passage (21) and the third passage (25), wherein the piston comprises:

one annularly circular contact portion (43) configured to contact the first inner wall surface (19) as the piston (5) is inserted in the first passage (17), and a pair of non-contact portions (39,41) configured not to contact the first inner wall surface (19) as the piston (5) is inserted in the first passage (17), located at both sides of the annularly circular contact portion (43) in a direction of extension of the first imaginary center line (L1) and having an outside diameter that is smaller than that of the annularly circular contact portion (43);

the pair of non-contact portions (39,41) being shaped to be plane-symmetric with respect to a first imaginary surface (S1) that includes the annularly circular contact portion (43) and is orthogonal to the first imaginary center line (L1), wherein:

the first section (11) of the housing (3) is formed with at least one groove portion (35,37) communicating with the first passage (17) to discharge air inside the first passage (17) when the piston (5) is inserted from the insertion port (7); and

the at least one groove portion (35,37) communicates with the insertion port (7), and extends along the first imaginary center line (L1); wherein :

a length of the at least one groove portion (35,37) along the first imaginary center line (L1) and a length of the non-contact portions (39,41) are determined such that air inside the housing (3) is discharged out of the housing (3) through the at least one groove portion (35,37) until the piston (5) is inserted into the first passage (17) to the extent that the annularly circular contact portion (43) goes beyond the at least one groove portion (35,37); and characterized in that a distance between an end portion of the at least one groove portion (35,37) on the first passage side and an end portion thereof on the insertion port side of the first section is equal to a distance between an end surface of the piston to be inserted into the first passage (17) and the annularly circular contact portion (43).

2. The viscous material container according to claim 1, wherein

the pair of non-contact portions (39,41) each have an annular non-contact surface (45) that is adjacent to the annularly circular contact portion (43) and has a diameter that is 90% or more of that of the first inner wall surface (19).

3. The viscous material container according to claim 1 or 2, wherein

the pair of non-contact portions (39,41) are shaped such that the annularly circular contact portion (43) is positioned at a vertex of an arcuate shape when the piston (5) is cut along a second imaginary surface (S2) that includes the first imaginary center line (L1) and that is orthogonal to the first imaginary surface (S1).

4. The viscous material container according to claim 1 or 2, wherein

an end portion (47) of each of the pair of non-contact portions (39,41) is shaped to surface-contact the third inner wall surface (27) surrounding the third passage.

5. The viscous material container according to claim 1 or 2, wherein:

the pair of non-contact portions (39,41) are shaped such that the annularly circular contact portion (43) is positioned at a vertex of an arcuate shape when the piston (5) is cut along a second imaginary surface (S2) that includes the first imaginary center line (L1) and that is orthogonal to the first imaginary surface(S1); and

an end portion (47) of each of the pair of non-contact portions (39,41) is shaped to surface-contact the third inner wall surface (27) surrounding the third passage(25).

6. The viscous material container according to claim 1, wherein

the housing (3) and the piston (5) are each unitarily formed from the same resin material.

Ansprüche

1. Behälter für viskoses Material zur Aufnahme eines viskosen Materials, das in den Behälter durch eine Einbringungsöffnung (7) des Behälters einzubringen ist, wobei der Behälter Folgendes umfasst:

ein Gehäuse (3), das Folgendes umfasst:

einen ersten Bereich (11), der die Einbringungsöffnung (7) an einem Ende desselben aufweist und eine erste Innenwandfläche (19) umfasst, die konfiguriert ist, einen ersten Kanal (17) zu umgeben, der sich entlang einer ersten imaginären Mittellinie (L1) von der Einbringungsöffnung (7) erstreckt und eine quer verlaufende Querschnittsform aufweist, die um die erste imaginäre Mittellinie (L1) kreisförmig ist;

einen zweiten Bereich (13), der eine Austrittsöffnung (9) an einem Ende desselben aufweist und eine zweite Innenwandfläche (23) aufweist, die konfiguriert ist, einen zweiten Kanal (21) zu umgeben, der sich entlang einer zweiten imaginären Mittellinie (L2) von der Austrittsöffnung erstreckt und eine quer verlaufende Querschnittsform aufweist, die um die zweite imaginäre Mittellinie (L2) kreisförmig ist, wobei die zweite imaginäre Mittellinie (L2) die erste imaginäre Mittellinie (L1) schneidet; und

einen dritten Bereich (15), der zwischen dem ersten Bereich (11) und dem zweiten Bereich (13) positioniert ist und eine dritte Innenwandfläche (27) umfasst, die konfiguriert ist, einen dritten Kanal (25) zu umgeben, der mit dem ersten Kanal (17) und dem zweiten Kanal (21) kommuniziert; und

einen Kolben (5), der ausgelegt ist, sich im Inneren zumindest des ersten Kanals (17) zu bewegen, um ein viskoses Material, das zumindest im ersten Kanal (17) enthalten ist, von der Austrittsöffnung durch den zweiten Kanal (21) und den dritten Kanal (25) hindurch auszustoßen,

worin der Kolben Folgendes umfasst:

einen ringkreisförmigen Kontaktabschnitt (43), der konfiguriert ist, die erste Innenwandfläche (19) zu berühren, wenn der Kolben (5) in den ersten Kanal (17) eingebracht wird, und ein Paar von Nicht-Kontakt-Abschnitten (39, 41), die konfiguriert sind, die erste Innenwandfläche (19) nicht zu berühren, wenn der Kolben (5) in den ersten Kanal (17) eingebracht wird, der auf beiden Seiten des ringkreisförmigen Kontaktabschnitts (43) in eine Erstreckungsrichtung der ersten imaginären Mittellinie (L1) angeordnet ist und einen Außendurchmesser aufweist, der kleiner als derjenige des ringkreisförmigen Kontaktabschnitts (43) ist;

wobei das Nicht-Kontakt-Abschnitte-Paar (39, 41) derart geformt ist, dass es mit Bezug auf eine erste imaginäre Oberfläche (S1) ebenensymmetrisch ist, die den ringkreisförmigen Kontaktabschnitt (43) umfasst und zur ersten imaginären Mittellinie (L1) orthogonal ist, worin:

der erste Bereich (11) des Gehäuses (3) mit mindestens einem Nutabschnitt (35, 37) ausgebildet ist, der mit dem ersten Kanal (17) kommuniziert, um Luft im Inneren des ersten Kanals (17) austreten zu lassen, wenn der Kolben (5) von der Einbringungsöffnung (7) eingebracht wird;

der mindestens eine Nutabschnitt (35, 37) mit der Einbringungsöffnung (7) kommuniziert und sich entlang der ersten imaginären Mittellinie (L1) erstreckt;

worin:

eine Länge des mindestens einen Nutabschnitts (35, 37) entlang der ersten imaginären Mittellinie (L1) und eine Länge der Nicht-Kontakt-Abschnitte (39, 41) derart bestimmt werden, dass Luft im Inneren des Gehäuses (3) aus dem Gehäuse (3) durch den mindestens einen Nutabschnitt (35, 37) austreten gelassen wird, bis der Kolben (5) in den ersten Kanal (17) in dem Ausmaß eingebracht wird, dass der ringkreisförmige Kontaktabschnitt (43) über den mindestens einen Nutabschnitt (35, 37) hinausgeht; und

dadurch gekennzeichnet, dass

ein Abstand zwischen einem Endabschnitt des mindestens einen Nutabschnitts (35, 37) auf der ersten Kanalseite und einem Endabschnitt desselben auf der Einbringungsöffnungsseite des ersten Bereichs gleich einem Abstand zwischen einer Endoberfläche des Kolbens ist, um in den ersten Kanal (17) und den ringkreisförmigen Kontaktabschnitt (43) eingebracht zu werden.

2. Behälter für viskoses Material gemäß Anspruch 1, worin
jeder Abschnitt des Nicht-Kontakt-Abschnitte-Paars (39, 41) jeweils eine ringförmige Nicht-Kontakt-Oberfläche (45) aufweist, die an den ringkreisförmigen Kontaktabschnitt (43) angrenzend angeordnet ist und einen Durchmesser aufweist, der 90% oder größer als derjenige der ersten Innenwandfläche (19) ist.

3. Behälter für viskoses Material gemäß Anspruch 1 oder 2, worin
das Nicht-Kontakt-Abschnitte-Paar (39, 41) derart geformt ist, dass der ringkreisförmige Kontaktabschnitt (43) an einem Scheitelpunkt einer bogenförmigen Form positioniert ist, wenn der Kolben (5) entlang einer zweiten imaginären Oberfläche (S2) geschnitten wird, welche die erste imaginäre Mittellinie (L1) umfasst und welche zur ersten imaginären Oberfläche (S1) orthogonal ist.

4. Behälter für viskoses Material gemäß Anspruch 1 oder 2, worin
ein Endabschnitt (47) von jedem Abschnitt des Nicht-Kontakt-Abschnitte-Paars (39, 41) derart geformt ist, dass er die dritte Innenwandfläche (27), die den dritten Kanal umgibt, an der Oberfläche berührt.

5. Behälter für viskoses Material gemäß Anspruch 1 oder 2, worin:

das Nicht-Kontakt-Abschnitte-Paar (39, 41) derart geformt ist, dass der ringkreisförmige Kontaktabschnitt (43) an einem Scheitelpunkt einer bogenförmigen Form positioniert ist, wenn der Kolben (5) entlang einer zweiten imaginären Oberfläche (S2) geschnitten wird, welche die erste imaginäre Mittellinie (L1) umfasst und welche zur ersten imaginären Oberfläche (S1) orthogonal ist; und

ein Endabschnitt (47) von jedem Abschnitt des Nicht-Kontakt-Abschnitte-Paars (39,41) derart geformt ist, dass er die dritte Innenwandfläche (27), welche den dritten Kanal (25) umgibt, an der Oberfläche berührt.

6. Behälter für viskoses Material gemäß Anspruch 1, worin
das Gehäuse (3) und der Kolben (5) jeweils einheitlich aus demselben Harzmaterial gebildet sind.

Revendications

1. Conteneur de matériau visqueux destiné à contenir un matériau visqueux devant être inséré dans le conteneur à travers un orifice d'insertion (7) du conteneur, le conteneur comprenant :

un boîtier (3) comprenant :

un premier tronçon (11) ayant un orifice d'insertion (7) à une extrémité de celui-ci et comprenant une première surface de paroi intérieure (19) configurée pour entourer un premier passage (17) s'étendant le long d'une première ligne médiane imaginaire (L1) à partir de l'orifice d'insertion (7) et ayant une forme en coupe transversale qui est circulaire autour de la première ligne médiane imaginaire (L1) ;

un deuxième tronçon (13) ayant un orifice d'évacuation (9) à une extrémité de celui-ci et comportant une deuxième surface de paroi intérieure (23) configurée pour entourer un deuxième passage (21) s'étendant le long d'une deuxième ligne médiane imaginaire (L2) à partir de l'orifice d'évacuation (9) et ayant une forme en coupe transversale qui est circulaire autour de la deuxième ligne médiane imaginaire (L2), la deuxième ligne médiane imaginaire (L2) coupant la première ligne centrale imaginaire (L1) ; et

un troisième tronçon (15) positionné entre le premier tronçon (11) et le deuxième tronçon (13) et comprenant une troisième surface de paroi intérieure (27) configurée pour entourer un troisième passage (25) communiquant avec le premier passage (17) et le deuxième passage (21) ; et

un piston (5) opérationnel pour se déplacer à l'intérieur d'au moins le premier passage (17) pour pousser vers l'extérieur un matériau visqueux, qui est contenu dans au moins le premier passage (17), à partir de l'orifice d'évacuation à travers le deuxième passage (21) et le troisième passage (25), dans lequel le piston comprend :

une partie de contact annulairement circulaire (43) configurée pour venir en contact avec la première surface de paroi intérieure (19) lorsque le piston (5) est inséré dans le premier passage (17), et une paire de parties de non-contact (39, 41) configurées pour ne pas venir en contact avec la première surface de paroi intérieure (19) lorsque le piston (5) est inséré dans le premier passage (17), situées des deux côtés de la partie de contact annulairement circulaire (43) dans une direction d'extension de la première ligne centrale imaginaire (L1) et ayant un diamètre extérieur qui est plus petit que celui de la partie de contact annulairement circulaire (43) ;

la paire de parties de non-contact (39,41) étant mises en forme pour être planes-symétriques par rapport à une première surface imaginaire (S1) qui comprend la partie de contact annulairement circulaire (43) et est orthogonale à la première ligne centrale imaginaire (L1), dans lequel :

le premier tronçon (11) du boîtier (3) est formé avec au moins une partie de rainure (35, 37) communiquant avec le premier passage (17) pour évacuer de l'air situé à l'intérieur du premier passage (17) lorsque le piston (5) est inséré à partir de l'orifice d'insertion (7) ;

la au moins une partie de rainure (35, 37) communique avec l'orifice d'insertion (7), et s'étend le long de la première ligne médiane imaginaire (L1) ;

dans lequel

une longueur de la au moins une partie de rainure (35, 37) le long de la première ligne médiane imaginaire (L1) et une longueur des parties de non-contact (39, 41) sont déterminées de telle sorte que de l'air situé à l'intérieur du boîtier (3) est évacué du boîtier (3) à travers la au moins une partie de rainure (35, 37) jusqu'à ce que le piston (5) soit inséré dans le premier passage (17) dans la mesure où la partie de contact annulairement circulaire (43) va au-delà de la au moins une partie de rainure (35, 37) ; et

caractérisé en ce que

une distance entre une partie d'extrémité de la au moins une partie de rainure (35,37) du côté du premier passage et une partie d'extrémité de celle-ci du côté de l'orifice d'insertion du premier tronçon est égale à une distance entre une surface d'extrémité du piston à insérer dans le premier passage (17) et la partie de contact annulairement circulaire (43).

2. Conteneur de matériau visqueux selon la revendication 1, dans lequel
la paire de parties de non-contact (39,41) présentent chacune une surface de non-contact annulaire (45) qui est adjacente à la partie de contact annulairement circulaire (43) et a un diamètre qui équivaut à 90 % ou plus de celui de la première surface de paroi intérieure (19).

3. Conteneur de matériau visqueux selon la revendication 1 ou 2, dans lequel
la paire de parties de non-contact (39,41) sont mises en forme de telle sorte que la partie de contact annulairement circulaire (43) est positionnée au niveau d'un sommet d'une forme en arc lorsque le piston (5) est découpé le long d'une deuxième surface imaginaire (S2) qui comprend la première ligne centrale imaginaire (L1) et qui est orthogonale à la première surface imaginaire (S1).

4. Conteneur de matériau visqueux selon la revendication 1 ou 2, dans lequel
une partie d'extrémité (47) de chacune de la paire de parties de non-contact (39,41) est mise en forme pour un contact de surface avec la troisième surface de paroi intérieure (27) entourant le troisième passage.

5. Conteneur de matériau visqueux selon la revendication 1 ou 2, dans lequel :

la paire de parties de non-contact (39,41) sont mises en forme de telle sorte que la partie de contact annulairement circulaire (43) est positionnée au niveau d'un sommet d'une forme en arc lorsque le piston (5) est découpé le long d'une deuxième surface imaginaire (S2) qui comprend la première ligne centrale imaginaire (L1) et qui est orthogonale à la première surface imaginaire (S1) ; et

une partie d'extrémité (47) de chacune de la paire de parties de non-contact (39,41) est mise en forme pour un contact de surface avec la troisième surface de paroi intérieure (27) entourant le troisième passage (25).

6. Conteneur de matériau visqueux selon la revendication 1, dans lequel
le boîtier (3) et le piston (5) sont chacun formés d'un seul tenant à partir du même matériau de résine.

Drawing